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George, Its hard to be specific on the comparison between lead-acid / nickel-cadmium / silver-cadmium / or silver-zinc. Each type battery can be constructed for low rate long discharge or high rate short time discharge performance. I took the following information from the YARDNEY engineering specs trying to compare the typical rate useage (medium-low rate) for a scooter. Note: the silver-cadmium cell is lighter than the lead acid and it is also only 1.1 volts under normal load. You can get more specifics from YARDNEY, 82 Mechanic St., Pawcatuck, CT, 06379, 1-203-599-3903. >From: gmiiii@in*.co* >Subject: Re: >To: urbanski@ma*.no*.mi* (Charles T. Urbanski), jrw@si*.do*.go*.au* >Cc: gmiiii@in*.co*, techdiver@terra.net >X-Mailer: SPRY Mail Version: 04.00.06.17 >Status: RO > > > Tim, is it correct to assume that the silver cad is about 1.5 the enregy >density of the nickel cad, and thus 3 times the lead acid, or is it only 1.25 >times the nickel cad, and thus 2.5 times the lead acid. Which did you mean? The silver-cadmium cell power density is approx 1.5-1.8 times the nickel-cadmium based on physical size (note: the silver-cadmium is lighter per cubic inch and size is the controlling factor for scooter use). Its interesting that YARDNEY shows the lead-acid batteries as being close to nickel-cadmium in power capacity (based on size - not weight) with the nickel-cadmium having 1.2-1.4 times the lead-acid. > I have finally gotten the dry cell nickels to where they are 100% reliable in >charging, discharging, and condition. There are some serious tricks to this , >expecially in my application, which they ar not intended for. You may find that >the exotics that you miltitary guys refer to have an appication that is as close >to an ideal state for any "cad" battery as is possible- outer space, where, as >you know, it is a little cooler than inside my scooter. You are doing it exactly the best and most correct way here. The main thing is to have the battery optimized for the application in the charge and discharge cycles. >George M. Irvine III >DIR WKPP >1400 SE 11 ST Ft Lauderdale, FL 33316 >954-493-6655 FAX 6698 >Email gmiiii@in*.co* Regards, Tim
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